Have you take a look at Cucumber? http://cukes.info/ http://cukes.info/ I don't personally use that (I use capybara for acceptance testing) but it seems to do

Have you take a look at Cucumber? http://cukes.info/ http://cukes.info/ I don't personally use that (I use capybara for acceptance testing) but it seems to do the job in terms of natural language and "versatility"